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Fortified foods provide some B12: Fortified plant-based milk alternatives (soya, almond, oat) typically provide 0.41 microgram per serving Fortified breakfast cereals may contain 25100% of the reference intake per serving Fortified nutritional yeast provides variable amounts depending on the brand Fortified meat alternatives and plant-based products increasingly include added B12 The NHS advises that vegans should take a B12 supplement during pregnancy, as fortified foods may not reliably meet increased needs

doi:10.1093/ajcn/76.4.897

When stored properly, a reconstituted vial should maintain its potency for several weeks